remote.con commit remote: drop free_refspecs() function (a56eea2)
   1#include "cache.h"
   2#include "remote.h"
   3#include "refs.h"
   4#include "commit.h"
   5#include "diff.h"
   6#include "revision.h"
   7#include "dir.h"
   8#include "tag.h"
   9#include "string-list.h"
  10#include "mergesort.h"
  11#include "argv-array.h"
  12
  13enum map_direction { FROM_SRC, FROM_DST };
  14
  15static struct refspec s_tag_refspec = {
  16        0,
  17        1,
  18        0,
  19        0,
  20        "refs/tags/*",
  21        "refs/tags/*"
  22};
  23
  24const struct refspec *tag_refspec = &s_tag_refspec;
  25
  26struct counted_string {
  27        size_t len;
  28        const char *s;
  29};
  30struct rewrite {
  31        const char *base;
  32        size_t baselen;
  33        struct counted_string *instead_of;
  34        int instead_of_nr;
  35        int instead_of_alloc;
  36};
  37struct rewrites {
  38        struct rewrite **rewrite;
  39        int rewrite_alloc;
  40        int rewrite_nr;
  41};
  42
  43static struct remote **remotes;
  44static int remotes_alloc;
  45static int remotes_nr;
  46static struct hashmap remotes_hash;
  47
  48static struct branch **branches;
  49static int branches_alloc;
  50static int branches_nr;
  51
  52static struct branch *current_branch;
  53static const char *pushremote_name;
  54
  55static struct rewrites rewrites;
  56static struct rewrites rewrites_push;
  57
  58static int valid_remote(const struct remote *remote)
  59{
  60        return (!!remote->url) || (!!remote->foreign_vcs);
  61}
  62
  63static const char *alias_url(const char *url, struct rewrites *r)
  64{
  65        int i, j;
  66        struct counted_string *longest;
  67        int longest_i;
  68
  69        longest = NULL;
  70        longest_i = -1;
  71        for (i = 0; i < r->rewrite_nr; i++) {
  72                if (!r->rewrite[i])
  73                        continue;
  74                for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
  75                        if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
  76                            (!longest ||
  77                             longest->len < r->rewrite[i]->instead_of[j].len)) {
  78                                longest = &(r->rewrite[i]->instead_of[j]);
  79                                longest_i = i;
  80                        }
  81                }
  82        }
  83        if (!longest)
  84                return url;
  85
  86        return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
  87}
  88
  89static void add_push_refspec(struct remote *remote, const char *ref)
  90{
  91        ALLOC_GROW(remote->push_refspec,
  92                   remote->push_refspec_nr + 1,
  93                   remote->push_refspec_alloc);
  94        remote->push_refspec[remote->push_refspec_nr++] = ref;
  95}
  96
  97static void add_fetch_refspec(struct remote *remote, const char *ref)
  98{
  99        ALLOC_GROW(remote->fetch_refspec,
 100                   remote->fetch_refspec_nr + 1,
 101                   remote->fetch_refspec_alloc);
 102        remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
 103}
 104
 105static void add_url(struct remote *remote, const char *url)
 106{
 107        ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
 108        remote->url[remote->url_nr++] = url;
 109}
 110
 111static void add_pushurl(struct remote *remote, const char *pushurl)
 112{
 113        ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
 114        remote->pushurl[remote->pushurl_nr++] = pushurl;
 115}
 116
 117static void add_pushurl_alias(struct remote *remote, const char *url)
 118{
 119        const char *pushurl = alias_url(url, &rewrites_push);
 120        if (pushurl != url)
 121                add_pushurl(remote, pushurl);
 122}
 123
 124static void add_url_alias(struct remote *remote, const char *url)
 125{
 126        add_url(remote, alias_url(url, &rewrites));
 127        add_pushurl_alias(remote, url);
 128}
 129
 130struct remotes_hash_key {
 131        const char *str;
 132        int len;
 133};
 134
 135static int remotes_hash_cmp(const struct remote *a, const struct remote *b, const struct remotes_hash_key *key)
 136{
 137        if (key)
 138                return strncmp(a->name, key->str, key->len) || a->name[key->len];
 139        else
 140                return strcmp(a->name, b->name);
 141}
 142
 143static inline void init_remotes_hash(void)
 144{
 145        if (!remotes_hash.cmpfn)
 146                hashmap_init(&remotes_hash, (hashmap_cmp_fn)remotes_hash_cmp, 0);
 147}
 148
 149static struct remote *make_remote(const char *name, int len)
 150{
 151        struct remote *ret, *replaced;
 152        struct remotes_hash_key lookup;
 153        struct hashmap_entry lookup_entry;
 154
 155        if (!len)
 156                len = strlen(name);
 157
 158        init_remotes_hash();
 159        lookup.str = name;
 160        lookup.len = len;
 161        hashmap_entry_init(&lookup_entry, memhash(name, len));
 162
 163        if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
 164                return ret;
 165
 166        ret = xcalloc(1, sizeof(struct remote));
 167        ret->prune = -1;  /* unspecified */
 168        ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
 169        remotes[remotes_nr++] = ret;
 170        ret->name = xstrndup(name, len);
 171
 172        hashmap_entry_init(ret, lookup_entry.hash);
 173        replaced = hashmap_put(&remotes_hash, ret);
 174        assert(replaced == NULL);  /* no previous entry overwritten */
 175        return ret;
 176}
 177
 178static void add_merge(struct branch *branch, const char *name)
 179{
 180        ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
 181                   branch->merge_alloc);
 182        branch->merge_name[branch->merge_nr++] = name;
 183}
 184
 185static struct branch *make_branch(const char *name, int len)
 186{
 187        struct branch *ret;
 188        int i;
 189
 190        for (i = 0; i < branches_nr; i++) {
 191                if (len ? (!strncmp(name, branches[i]->name, len) &&
 192                           !branches[i]->name[len]) :
 193                    !strcmp(name, branches[i]->name))
 194                        return branches[i];
 195        }
 196
 197        ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
 198        ret = xcalloc(1, sizeof(struct branch));
 199        branches[branches_nr++] = ret;
 200        if (len)
 201                ret->name = xstrndup(name, len);
 202        else
 203                ret->name = xstrdup(name);
 204        ret->refname = xstrfmt("refs/heads/%s", ret->name);
 205
 206        return ret;
 207}
 208
 209static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
 210{
 211        struct rewrite *ret;
 212        int i;
 213
 214        for (i = 0; i < r->rewrite_nr; i++) {
 215                if (len
 216                    ? (len == r->rewrite[i]->baselen &&
 217                       !strncmp(base, r->rewrite[i]->base, len))
 218                    : !strcmp(base, r->rewrite[i]->base))
 219                        return r->rewrite[i];
 220        }
 221
 222        ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
 223        ret = xcalloc(1, sizeof(struct rewrite));
 224        r->rewrite[r->rewrite_nr++] = ret;
 225        if (len) {
 226                ret->base = xstrndup(base, len);
 227                ret->baselen = len;
 228        }
 229        else {
 230                ret->base = xstrdup(base);
 231                ret->baselen = strlen(base);
 232        }
 233        return ret;
 234}
 235
 236static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
 237{
 238        ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
 239        rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
 240        rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
 241        rewrite->instead_of_nr++;
 242}
 243
 244static const char *skip_spaces(const char *s)
 245{
 246        while (isspace(*s))
 247                s++;
 248        return s;
 249}
 250
 251static void read_remotes_file(struct remote *remote)
 252{
 253        struct strbuf buf = STRBUF_INIT;
 254        FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
 255
 256        if (!f)
 257                return;
 258        remote->configured_in_repo = 1;
 259        remote->origin = REMOTE_REMOTES;
 260        while (strbuf_getline(&buf, f) != EOF) {
 261                const char *v;
 262
 263                strbuf_rtrim(&buf);
 264
 265                if (skip_prefix(buf.buf, "URL:", &v))
 266                        add_url_alias(remote, xstrdup(skip_spaces(v)));
 267                else if (skip_prefix(buf.buf, "Push:", &v))
 268                        add_push_refspec(remote, xstrdup(skip_spaces(v)));
 269                else if (skip_prefix(buf.buf, "Pull:", &v))
 270                        add_fetch_refspec(remote, xstrdup(skip_spaces(v)));
 271        }
 272        strbuf_release(&buf);
 273        fclose(f);
 274}
 275
 276static void read_branches_file(struct remote *remote)
 277{
 278        char *frag;
 279        struct strbuf buf = STRBUF_INIT;
 280        FILE *f = fopen(git_path("branches/%s", remote->name), "r");
 281
 282        if (!f)
 283                return;
 284
 285        strbuf_getline_lf(&buf, f);
 286        fclose(f);
 287        strbuf_trim(&buf);
 288        if (!buf.len) {
 289                strbuf_release(&buf);
 290                return;
 291        }
 292
 293        remote->configured_in_repo = 1;
 294        remote->origin = REMOTE_BRANCHES;
 295
 296        /*
 297         * The branches file would have URL and optionally
 298         * #branch specified.  The "master" (or specified) branch is
 299         * fetched and stored in the local branch matching the
 300         * remote name.
 301         */
 302        frag = strchr(buf.buf, '#');
 303        if (frag)
 304                *(frag++) = '\0';
 305        else
 306                frag = "master";
 307
 308        add_url_alias(remote, strbuf_detach(&buf, NULL));
 309        add_fetch_refspec(remote, xstrfmt("refs/heads/%s:refs/heads/%s",
 310                                          frag, remote->name));
 311
 312        /*
 313         * Cogito compatible push: push current HEAD to remote #branch
 314         * (master if missing)
 315         */
 316        add_push_refspec(remote, xstrfmt("HEAD:refs/heads/%s", frag));
 317        remote->fetch_tags = 1; /* always auto-follow */
 318}
 319
 320static int handle_config(const char *key, const char *value, void *cb)
 321{
 322        const char *name;
 323        int namelen;
 324        const char *subkey;
 325        struct remote *remote;
 326        struct branch *branch;
 327        if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
 328                if (!name)
 329                        return 0;
 330                branch = make_branch(name, namelen);
 331                if (!strcmp(subkey, "remote")) {
 332                        return git_config_string(&branch->remote_name, key, value);
 333                } else if (!strcmp(subkey, "pushremote")) {
 334                        return git_config_string(&branch->pushremote_name, key, value);
 335                } else if (!strcmp(subkey, "merge")) {
 336                        if (!value)
 337                                return config_error_nonbool(key);
 338                        add_merge(branch, xstrdup(value));
 339                }
 340                return 0;
 341        }
 342        if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
 343                struct rewrite *rewrite;
 344                if (!name)
 345                        return 0;
 346                if (!strcmp(subkey, "insteadof")) {
 347                        rewrite = make_rewrite(&rewrites, name, namelen);
 348                        if (!value)
 349                                return config_error_nonbool(key);
 350                        add_instead_of(rewrite, xstrdup(value));
 351                } else if (!strcmp(subkey, "pushinsteadof")) {
 352                        rewrite = make_rewrite(&rewrites_push, name, namelen);
 353                        if (!value)
 354                                return config_error_nonbool(key);
 355                        add_instead_of(rewrite, xstrdup(value));
 356                }
 357        }
 358
 359        if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
 360                return 0;
 361
 362        /* Handle remote.* variables */
 363        if (!name && !strcmp(subkey, "pushdefault"))
 364                return git_config_string(&pushremote_name, key, value);
 365
 366        if (!name)
 367                return 0;
 368        /* Handle remote.<name>.* variables */
 369        if (*name == '/') {
 370                warning("Config remote shorthand cannot begin with '/': %s",
 371                        name);
 372                return 0;
 373        }
 374        remote = make_remote(name, namelen);
 375        remote->origin = REMOTE_CONFIG;
 376        if (current_config_scope() == CONFIG_SCOPE_REPO)
 377                remote->configured_in_repo = 1;
 378        if (!strcmp(subkey, "mirror"))
 379                remote->mirror = git_config_bool(key, value);
 380        else if (!strcmp(subkey, "skipdefaultupdate"))
 381                remote->skip_default_update = git_config_bool(key, value);
 382        else if (!strcmp(subkey, "skipfetchall"))
 383                remote->skip_default_update = git_config_bool(key, value);
 384        else if (!strcmp(subkey, "prune"))
 385                remote->prune = git_config_bool(key, value);
 386        else if (!strcmp(subkey, "url")) {
 387                const char *v;
 388                if (git_config_string(&v, key, value))
 389                        return -1;
 390                add_url(remote, v);
 391        } else if (!strcmp(subkey, "pushurl")) {
 392                const char *v;
 393                if (git_config_string(&v, key, value))
 394                        return -1;
 395                add_pushurl(remote, v);
 396        } else if (!strcmp(subkey, "push")) {
 397                const char *v;
 398                if (git_config_string(&v, key, value))
 399                        return -1;
 400                add_push_refspec(remote, v);
 401        } else if (!strcmp(subkey, "fetch")) {
 402                const char *v;
 403                if (git_config_string(&v, key, value))
 404                        return -1;
 405                add_fetch_refspec(remote, v);
 406        } else if (!strcmp(subkey, "receivepack")) {
 407                const char *v;
 408                if (git_config_string(&v, key, value))
 409                        return -1;
 410                if (!remote->receivepack)
 411                        remote->receivepack = v;
 412                else
 413                        error("more than one receivepack given, using the first");
 414        } else if (!strcmp(subkey, "uploadpack")) {
 415                const char *v;
 416                if (git_config_string(&v, key, value))
 417                        return -1;
 418                if (!remote->uploadpack)
 419                        remote->uploadpack = v;
 420                else
 421                        error("more than one uploadpack given, using the first");
 422        } else if (!strcmp(subkey, "tagopt")) {
 423                if (!strcmp(value, "--no-tags"))
 424                        remote->fetch_tags = -1;
 425                else if (!strcmp(value, "--tags"))
 426                        remote->fetch_tags = 2;
 427        } else if (!strcmp(subkey, "proxy")) {
 428                return git_config_string((const char **)&remote->http_proxy,
 429                                         key, value);
 430        } else if (!strcmp(subkey, "proxyauthmethod")) {
 431                return git_config_string((const char **)&remote->http_proxy_authmethod,
 432                                         key, value);
 433        } else if (!strcmp(subkey, "vcs")) {
 434                return git_config_string(&remote->foreign_vcs, key, value);
 435        }
 436        return 0;
 437}
 438
 439static void alias_all_urls(void)
 440{
 441        int i, j;
 442        for (i = 0; i < remotes_nr; i++) {
 443                int add_pushurl_aliases;
 444                if (!remotes[i])
 445                        continue;
 446                for (j = 0; j < remotes[i]->pushurl_nr; j++) {
 447                        remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
 448                }
 449                add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
 450                for (j = 0; j < remotes[i]->url_nr; j++) {
 451                        if (add_pushurl_aliases)
 452                                add_pushurl_alias(remotes[i], remotes[i]->url[j]);
 453                        remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
 454                }
 455        }
 456}
 457
 458static void read_config(void)
 459{
 460        static int loaded;
 461        struct object_id oid;
 462        int flag;
 463
 464        if (loaded)
 465                return;
 466        loaded = 1;
 467
 468        current_branch = NULL;
 469        if (startup_info->have_repository) {
 470                const char *head_ref = resolve_ref_unsafe("HEAD", 0, oid.hash, &flag);
 471                if (head_ref && (flag & REF_ISSYMREF) &&
 472                    skip_prefix(head_ref, "refs/heads/", &head_ref)) {
 473                        current_branch = make_branch(head_ref, 0);
 474                }
 475        }
 476        git_config(handle_config, NULL);
 477        alias_all_urls();
 478}
 479
 480static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
 481{
 482        int i;
 483        struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
 484
 485        for (i = 0; i < nr_refspec; i++) {
 486                size_t llen;
 487                int is_glob;
 488                const char *lhs, *rhs;
 489                int flags;
 490
 491                is_glob = 0;
 492
 493                lhs = refspec[i];
 494                if (*lhs == '+') {
 495                        rs[i].force = 1;
 496                        lhs++;
 497                }
 498
 499                rhs = strrchr(lhs, ':');
 500
 501                /*
 502                 * Before going on, special case ":" (or "+:") as a refspec
 503                 * for pushing matching refs.
 504                 */
 505                if (!fetch && rhs == lhs && rhs[1] == '\0') {
 506                        rs[i].matching = 1;
 507                        continue;
 508                }
 509
 510                if (rhs) {
 511                        size_t rlen = strlen(++rhs);
 512                        is_glob = (1 <= rlen && strchr(rhs, '*'));
 513                        rs[i].dst = xstrndup(rhs, rlen);
 514                }
 515
 516                llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
 517                if (1 <= llen && memchr(lhs, '*', llen)) {
 518                        if ((rhs && !is_glob) || (!rhs && fetch))
 519                                goto invalid;
 520                        is_glob = 1;
 521                } else if (rhs && is_glob) {
 522                        goto invalid;
 523                }
 524
 525                rs[i].pattern = is_glob;
 526                rs[i].src = xstrndup(lhs, llen);
 527                flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
 528
 529                if (fetch) {
 530                        struct object_id unused;
 531
 532                        /* LHS */
 533                        if (!*rs[i].src)
 534                                ; /* empty is ok; it means "HEAD" */
 535                        else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(rs[i].src, &unused))
 536                                rs[i].exact_sha1 = 1; /* ok */
 537                        else if (!check_refname_format(rs[i].src, flags))
 538                                ; /* valid looking ref is ok */
 539                        else
 540                                goto invalid;
 541                        /* RHS */
 542                        if (!rs[i].dst)
 543                                ; /* missing is ok; it is the same as empty */
 544                        else if (!*rs[i].dst)
 545                                ; /* empty is ok; it means "do not store" */
 546                        else if (!check_refname_format(rs[i].dst, flags))
 547                                ; /* valid looking ref is ok */
 548                        else
 549                                goto invalid;
 550                } else {
 551                        /*
 552                         * LHS
 553                         * - empty is allowed; it means delete.
 554                         * - when wildcarded, it must be a valid looking ref.
 555                         * - otherwise, it must be an extended SHA-1, but
 556                         *   there is no existing way to validate this.
 557                         */
 558                        if (!*rs[i].src)
 559                                ; /* empty is ok */
 560                        else if (is_glob) {
 561                                if (check_refname_format(rs[i].src, flags))
 562                                        goto invalid;
 563                        }
 564                        else
 565                                ; /* anything goes, for now */
 566                        /*
 567                         * RHS
 568                         * - missing is allowed, but LHS then must be a
 569                         *   valid looking ref.
 570                         * - empty is not allowed.
 571                         * - otherwise it must be a valid looking ref.
 572                         */
 573                        if (!rs[i].dst) {
 574                                if (check_refname_format(rs[i].src, flags))
 575                                        goto invalid;
 576                        } else if (!*rs[i].dst) {
 577                                goto invalid;
 578                        } else {
 579                                if (check_refname_format(rs[i].dst, flags))
 580                                        goto invalid;
 581                        }
 582                }
 583        }
 584        return rs;
 585
 586 invalid:
 587        if (verify) {
 588                /*
 589                 * nr_refspec must be greater than zero and i must be valid
 590                 * since it is only possible to reach this point from within
 591                 * the for loop above.
 592                 */
 593                free_refspec(i+1, rs);
 594                return NULL;
 595        }
 596        die("Invalid refspec '%s'", refspec[i]);
 597}
 598
 599int valid_fetch_refspec(const char *fetch_refspec_str)
 600{
 601        struct refspec *refspec;
 602
 603        refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
 604        free_refspec(1, refspec);
 605        return !!refspec;
 606}
 607
 608struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
 609{
 610        return parse_refspec_internal(nr_refspec, refspec, 1, 0);
 611}
 612
 613struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
 614{
 615        return parse_refspec_internal(nr_refspec, refspec, 0, 0);
 616}
 617
 618void free_refspec(int nr_refspec, struct refspec *refspec)
 619{
 620        int i;
 621
 622        if (!refspec)
 623                return;
 624
 625        for (i = 0; i < nr_refspec; i++) {
 626                free(refspec[i].src);
 627                free(refspec[i].dst);
 628        }
 629        free(refspec);
 630}
 631
 632static int valid_remote_nick(const char *name)
 633{
 634        if (!name[0] || is_dot_or_dotdot(name))
 635                return 0;
 636        return !strchr(name, '/'); /* no slash */
 637}
 638
 639const char *remote_for_branch(struct branch *branch, int *explicit)
 640{
 641        if (branch && branch->remote_name) {
 642                if (explicit)
 643                        *explicit = 1;
 644                return branch->remote_name;
 645        }
 646        if (explicit)
 647                *explicit = 0;
 648        return "origin";
 649}
 650
 651const char *pushremote_for_branch(struct branch *branch, int *explicit)
 652{
 653        if (branch && branch->pushremote_name) {
 654                if (explicit)
 655                        *explicit = 1;
 656                return branch->pushremote_name;
 657        }
 658        if (pushremote_name) {
 659                if (explicit)
 660                        *explicit = 1;
 661                return pushremote_name;
 662        }
 663        return remote_for_branch(branch, explicit);
 664}
 665
 666static struct remote *remote_get_1(const char *name,
 667                                   const char *(*get_default)(struct branch *, int *))
 668{
 669        struct remote *ret;
 670        int name_given = 0;
 671
 672        read_config();
 673
 674        if (name)
 675                name_given = 1;
 676        else
 677                name = get_default(current_branch, &name_given);
 678
 679        ret = make_remote(name, 0);
 680        if (valid_remote_nick(name) && have_git_dir()) {
 681                if (!valid_remote(ret))
 682                        read_remotes_file(ret);
 683                if (!valid_remote(ret))
 684                        read_branches_file(ret);
 685        }
 686        if (name_given && !valid_remote(ret))
 687                add_url_alias(ret, name);
 688        if (!valid_remote(ret))
 689                return NULL;
 690        ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
 691        ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
 692        return ret;
 693}
 694
 695struct remote *remote_get(const char *name)
 696{
 697        return remote_get_1(name, remote_for_branch);
 698}
 699
 700struct remote *pushremote_get(const char *name)
 701{
 702        return remote_get_1(name, pushremote_for_branch);
 703}
 704
 705int remote_is_configured(struct remote *remote, int in_repo)
 706{
 707        if (!remote)
 708                return 0;
 709        if (in_repo)
 710                return remote->configured_in_repo;
 711        return !!remote->origin;
 712}
 713
 714int for_each_remote(each_remote_fn fn, void *priv)
 715{
 716        int i, result = 0;
 717        read_config();
 718        for (i = 0; i < remotes_nr && !result; i++) {
 719                struct remote *r = remotes[i];
 720                if (!r)
 721                        continue;
 722                if (!r->fetch)
 723                        r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
 724                                                       r->fetch_refspec);
 725                if (!r->push)
 726                        r->push = parse_push_refspec(r->push_refspec_nr,
 727                                                     r->push_refspec);
 728                result = fn(r, priv);
 729        }
 730        return result;
 731}
 732
 733static void handle_duplicate(struct ref *ref1, struct ref *ref2)
 734{
 735        if (strcmp(ref1->name, ref2->name)) {
 736                if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
 737                    ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
 738                        die(_("Cannot fetch both %s and %s to %s"),
 739                            ref1->name, ref2->name, ref2->peer_ref->name);
 740                } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
 741                           ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
 742                        warning(_("%s usually tracks %s, not %s"),
 743                                ref2->peer_ref->name, ref2->name, ref1->name);
 744                } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
 745                           ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
 746                        die(_("%s tracks both %s and %s"),
 747                            ref2->peer_ref->name, ref1->name, ref2->name);
 748                } else {
 749                        /*
 750                         * This last possibility doesn't occur because
 751                         * FETCH_HEAD_IGNORE entries always appear at
 752                         * the end of the list.
 753                         */
 754                        die(_("Internal error"));
 755                }
 756        }
 757        free(ref2->peer_ref);
 758        free(ref2);
 759}
 760
 761struct ref *ref_remove_duplicates(struct ref *ref_map)
 762{
 763        struct string_list refs = STRING_LIST_INIT_NODUP;
 764        struct ref *retval = NULL;
 765        struct ref **p = &retval;
 766
 767        while (ref_map) {
 768                struct ref *ref = ref_map;
 769
 770                ref_map = ref_map->next;
 771                ref->next = NULL;
 772
 773                if (!ref->peer_ref) {
 774                        *p = ref;
 775                        p = &ref->next;
 776                } else {
 777                        struct string_list_item *item =
 778                                string_list_insert(&refs, ref->peer_ref->name);
 779
 780                        if (item->util) {
 781                                /* Entry already existed */
 782                                handle_duplicate((struct ref *)item->util, ref);
 783                        } else {
 784                                *p = ref;
 785                                p = &ref->next;
 786                                item->util = ref;
 787                        }
 788                }
 789        }
 790
 791        string_list_clear(&refs, 0);
 792        return retval;
 793}
 794
 795int remote_has_url(struct remote *remote, const char *url)
 796{
 797        int i;
 798        for (i = 0; i < remote->url_nr; i++) {
 799                if (!strcmp(remote->url[i], url))
 800                        return 1;
 801        }
 802        return 0;
 803}
 804
 805static int match_name_with_pattern(const char *key, const char *name,
 806                                   const char *value, char **result)
 807{
 808        const char *kstar = strchr(key, '*');
 809        size_t klen;
 810        size_t ksuffixlen;
 811        size_t namelen;
 812        int ret;
 813        if (!kstar)
 814                die("Key '%s' of pattern had no '*'", key);
 815        klen = kstar - key;
 816        ksuffixlen = strlen(kstar + 1);
 817        namelen = strlen(name);
 818        ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
 819                !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
 820        if (ret && value) {
 821                struct strbuf sb = STRBUF_INIT;
 822                const char *vstar = strchr(value, '*');
 823                if (!vstar)
 824                        die("Value '%s' of pattern has no '*'", value);
 825                strbuf_add(&sb, value, vstar - value);
 826                strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
 827                strbuf_addstr(&sb, vstar + 1);
 828                *result = strbuf_detach(&sb, NULL);
 829        }
 830        return ret;
 831}
 832
 833static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
 834{
 835        int i;
 836        int find_src = !query->src;
 837
 838        if (find_src && !query->dst)
 839                error("query_refspecs_multiple: need either src or dst");
 840
 841        for (i = 0; i < ref_count; i++) {
 842                struct refspec *refspec = &refs[i];
 843                const char *key = find_src ? refspec->dst : refspec->src;
 844                const char *value = find_src ? refspec->src : refspec->dst;
 845                const char *needle = find_src ? query->dst : query->src;
 846                char **result = find_src ? &query->src : &query->dst;
 847
 848                if (!refspec->dst)
 849                        continue;
 850                if (refspec->pattern) {
 851                        if (match_name_with_pattern(key, needle, value, result))
 852                                string_list_append_nodup(results, *result);
 853                } else if (!strcmp(needle, key)) {
 854                        string_list_append(results, value);
 855                }
 856        }
 857}
 858
 859int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
 860{
 861        int i;
 862        int find_src = !query->src;
 863        const char *needle = find_src ? query->dst : query->src;
 864        char **result = find_src ? &query->src : &query->dst;
 865
 866        if (find_src && !query->dst)
 867                return error("query_refspecs: need either src or dst");
 868
 869        for (i = 0; i < ref_count; i++) {
 870                struct refspec *refspec = &refs[i];
 871                const char *key = find_src ? refspec->dst : refspec->src;
 872                const char *value = find_src ? refspec->src : refspec->dst;
 873
 874                if (!refspec->dst)
 875                        continue;
 876                if (refspec->pattern) {
 877                        if (match_name_with_pattern(key, needle, value, result)) {
 878                                query->force = refspec->force;
 879                                return 0;
 880                        }
 881                } else if (!strcmp(needle, key)) {
 882                        *result = xstrdup(value);
 883                        query->force = refspec->force;
 884                        return 0;
 885                }
 886        }
 887        return -1;
 888}
 889
 890char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
 891                     const char *name)
 892{
 893        struct refspec query;
 894
 895        memset(&query, 0, sizeof(struct refspec));
 896        query.src = (char *)name;
 897
 898        if (query_refspecs(refspecs, nr_refspec, &query))
 899                return NULL;
 900
 901        return query.dst;
 902}
 903
 904int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 905{
 906        return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
 907}
 908
 909static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
 910                const char *name)
 911{
 912        size_t len = strlen(name);
 913        struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
 914        memcpy(ref->name, prefix, prefixlen);
 915        memcpy(ref->name + prefixlen, name, len);
 916        return ref;
 917}
 918
 919struct ref *alloc_ref(const char *name)
 920{
 921        return alloc_ref_with_prefix("", 0, name);
 922}
 923
 924struct ref *copy_ref(const struct ref *ref)
 925{
 926        struct ref *cpy;
 927        size_t len;
 928        if (!ref)
 929                return NULL;
 930        len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
 931        cpy = xmalloc(len);
 932        memcpy(cpy, ref, len);
 933        cpy->next = NULL;
 934        cpy->symref = xstrdup_or_null(ref->symref);
 935        cpy->remote_status = xstrdup_or_null(ref->remote_status);
 936        cpy->peer_ref = copy_ref(ref->peer_ref);
 937        return cpy;
 938}
 939
 940struct ref *copy_ref_list(const struct ref *ref)
 941{
 942        struct ref *ret = NULL;
 943        struct ref **tail = &ret;
 944        while (ref) {
 945                *tail = copy_ref(ref);
 946                ref = ref->next;
 947                tail = &((*tail)->next);
 948        }
 949        return ret;
 950}
 951
 952static void free_ref(struct ref *ref)
 953{
 954        if (!ref)
 955                return;
 956        free_ref(ref->peer_ref);
 957        free(ref->remote_status);
 958        free(ref->symref);
 959        free(ref);
 960}
 961
 962void free_refs(struct ref *ref)
 963{
 964        struct ref *next;
 965        while (ref) {
 966                next = ref->next;
 967                free_ref(ref);
 968                ref = next;
 969        }
 970}
 971
 972int ref_compare_name(const void *va, const void *vb)
 973{
 974        const struct ref *a = va, *b = vb;
 975        return strcmp(a->name, b->name);
 976}
 977
 978static void *ref_list_get_next(const void *a)
 979{
 980        return ((const struct ref *)a)->next;
 981}
 982
 983static void ref_list_set_next(void *a, void *next)
 984{
 985        ((struct ref *)a)->next = next;
 986}
 987
 988void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
 989{
 990        *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
 991}
 992
 993int count_refspec_match(const char *pattern,
 994                        struct ref *refs,
 995                        struct ref **matched_ref)
 996{
 997        int patlen = strlen(pattern);
 998        struct ref *matched_weak = NULL;
 999        struct ref *matched = NULL;
1000        int weak_match = 0;
1001        int match = 0;
1002
1003        for (weak_match = match = 0; refs; refs = refs->next) {
1004                char *name = refs->name;
1005                int namelen = strlen(name);
1006
1007                if (!refname_match(pattern, name))
1008                        continue;
1009
1010                /* A match is "weak" if it is with refs outside
1011                 * heads or tags, and did not specify the pattern
1012                 * in full (e.g. "refs/remotes/origin/master") or at
1013                 * least from the toplevel (e.g. "remotes/origin/master");
1014                 * otherwise "git push $URL master" would result in
1015                 * ambiguity between remotes/origin/master and heads/master
1016                 * at the remote site.
1017                 */
1018                if (namelen != patlen &&
1019                    patlen != namelen - 5 &&
1020                    !starts_with(name, "refs/heads/") &&
1021                    !starts_with(name, "refs/tags/")) {
1022                        /* We want to catch the case where only weak
1023                         * matches are found and there are multiple
1024                         * matches, and where more than one strong
1025                         * matches are found, as ambiguous.  One
1026                         * strong match with zero or more weak matches
1027                         * are acceptable as a unique match.
1028                         */
1029                        matched_weak = refs;
1030                        weak_match++;
1031                }
1032                else {
1033                        matched = refs;
1034                        match++;
1035                }
1036        }
1037        if (!matched) {
1038                if (matched_ref)
1039                        *matched_ref = matched_weak;
1040                return weak_match;
1041        }
1042        else {
1043                if (matched_ref)
1044                        *matched_ref = matched;
1045                return match;
1046        }
1047}
1048
1049static void tail_link_ref(struct ref *ref, struct ref ***tail)
1050{
1051        **tail = ref;
1052        while (ref->next)
1053                ref = ref->next;
1054        *tail = &ref->next;
1055}
1056
1057static struct ref *alloc_delete_ref(void)
1058{
1059        struct ref *ref = alloc_ref("(delete)");
1060        oidclr(&ref->new_oid);
1061        return ref;
1062}
1063
1064static int try_explicit_object_name(const char *name,
1065                                    struct ref **match)
1066{
1067        struct object_id oid;
1068
1069        if (!*name) {
1070                if (match)
1071                        *match = alloc_delete_ref();
1072                return 0;
1073        }
1074
1075        if (get_sha1(name, oid.hash))
1076                return -1;
1077
1078        if (match) {
1079                *match = alloc_ref(name);
1080                oidcpy(&(*match)->new_oid, &oid);
1081        }
1082        return 0;
1083}
1084
1085static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1086{
1087        struct ref *ret = alloc_ref(name);
1088        tail_link_ref(ret, tail);
1089        return ret;
1090}
1091
1092static char *guess_ref(const char *name, struct ref *peer)
1093{
1094        struct strbuf buf = STRBUF_INIT;
1095        struct object_id oid;
1096
1097        const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1098                                           oid.hash, NULL);
1099        if (!r)
1100                return NULL;
1101
1102        if (starts_with(r, "refs/heads/"))
1103                strbuf_addstr(&buf, "refs/heads/");
1104        else if (starts_with(r, "refs/tags/"))
1105                strbuf_addstr(&buf, "refs/tags/");
1106        else
1107                return NULL;
1108
1109        strbuf_addstr(&buf, name);
1110        return strbuf_detach(&buf, NULL);
1111}
1112
1113static int match_explicit_lhs(struct ref *src,
1114                              struct refspec *rs,
1115                              struct ref **match,
1116                              int *allocated_match)
1117{
1118        switch (count_refspec_match(rs->src, src, match)) {
1119        case 1:
1120                if (allocated_match)
1121                        *allocated_match = 0;
1122                return 0;
1123        case 0:
1124                /* The source could be in the get_sha1() format
1125                 * not a reference name.  :refs/other is a
1126                 * way to delete 'other' ref at the remote end.
1127                 */
1128                if (try_explicit_object_name(rs->src, match) < 0)
1129                        return error("src refspec %s does not match any.", rs->src);
1130                if (allocated_match)
1131                        *allocated_match = 1;
1132                return 0;
1133        default:
1134                return error("src refspec %s matches more than one.", rs->src);
1135        }
1136}
1137
1138static int match_explicit(struct ref *src, struct ref *dst,
1139                          struct ref ***dst_tail,
1140                          struct refspec *rs)
1141{
1142        struct ref *matched_src, *matched_dst;
1143        int allocated_src;
1144
1145        const char *dst_value = rs->dst;
1146        char *dst_guess;
1147
1148        if (rs->pattern || rs->matching)
1149                return 0;
1150
1151        matched_src = matched_dst = NULL;
1152        if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1153                return -1;
1154
1155        if (!dst_value) {
1156                struct object_id oid;
1157                int flag;
1158
1159                dst_value = resolve_ref_unsafe(matched_src->name,
1160                                               RESOLVE_REF_READING,
1161                                               oid.hash, &flag);
1162                if (!dst_value ||
1163                    ((flag & REF_ISSYMREF) &&
1164                     !starts_with(dst_value, "refs/heads/")))
1165                        die("%s cannot be resolved to branch.",
1166                            matched_src->name);
1167        }
1168
1169        switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1170        case 1:
1171                break;
1172        case 0:
1173                if (starts_with(dst_value, "refs/"))
1174                        matched_dst = make_linked_ref(dst_value, dst_tail);
1175                else if (is_null_oid(&matched_src->new_oid))
1176                        error("unable to delete '%s': remote ref does not exist",
1177                              dst_value);
1178                else if ((dst_guess = guess_ref(dst_value, matched_src)))
1179                        matched_dst = make_linked_ref(dst_guess, dst_tail);
1180                else
1181                        error("unable to push to unqualified destination: %s\n"
1182                              "The destination refspec neither matches an "
1183                              "existing ref on the remote nor\n"
1184                              "begins with refs/, and we are unable to "
1185                              "guess a prefix based on the source ref.",
1186                              dst_value);
1187                break;
1188        default:
1189                matched_dst = NULL;
1190                error("dst refspec %s matches more than one.",
1191                      dst_value);
1192                break;
1193        }
1194        if (!matched_dst)
1195                return -1;
1196        if (matched_dst->peer_ref)
1197                return error("dst ref %s receives from more than one src.",
1198                      matched_dst->name);
1199        else {
1200                matched_dst->peer_ref = allocated_src ?
1201                                        matched_src :
1202                                        copy_ref(matched_src);
1203                matched_dst->force = rs->force;
1204        }
1205        return 0;
1206}
1207
1208static int match_explicit_refs(struct ref *src, struct ref *dst,
1209                               struct ref ***dst_tail, struct refspec *rs,
1210                               int rs_nr)
1211{
1212        int i, errs;
1213        for (i = errs = 0; i < rs_nr; i++)
1214                errs += match_explicit(src, dst, dst_tail, &rs[i]);
1215        return errs;
1216}
1217
1218static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1219                int send_mirror, int direction, const struct refspec **ret_pat)
1220{
1221        const struct refspec *pat;
1222        char *name;
1223        int i;
1224        int matching_refs = -1;
1225        for (i = 0; i < rs_nr; i++) {
1226                if (rs[i].matching &&
1227                    (matching_refs == -1 || rs[i].force)) {
1228                        matching_refs = i;
1229                        continue;
1230                }
1231
1232                if (rs[i].pattern) {
1233                        const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1234                        int match;
1235                        if (direction == FROM_SRC)
1236                                match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1237                        else
1238                                match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1239                        if (match) {
1240                                matching_refs = i;
1241                                break;
1242                        }
1243                }
1244        }
1245        if (matching_refs == -1)
1246                return NULL;
1247
1248        pat = rs + matching_refs;
1249        if (pat->matching) {
1250                /*
1251                 * "matching refs"; traditionally we pushed everything
1252                 * including refs outside refs/heads/ hierarchy, but
1253                 * that does not make much sense these days.
1254                 */
1255                if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1256                        return NULL;
1257                name = xstrdup(ref->name);
1258        }
1259        if (ret_pat)
1260                *ret_pat = pat;
1261        return name;
1262}
1263
1264static struct ref **tail_ref(struct ref **head)
1265{
1266        struct ref **tail = head;
1267        while (*tail)
1268                tail = &((*tail)->next);
1269        return tail;
1270}
1271
1272struct tips {
1273        struct commit **tip;
1274        int nr, alloc;
1275};
1276
1277static void add_to_tips(struct tips *tips, const struct object_id *oid)
1278{
1279        struct commit *commit;
1280
1281        if (is_null_oid(oid))
1282                return;
1283        commit = lookup_commit_reference_gently(oid->hash, 1);
1284        if (!commit || (commit->object.flags & TMP_MARK))
1285                return;
1286        commit->object.flags |= TMP_MARK;
1287        ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1288        tips->tip[tips->nr++] = commit;
1289}
1290
1291static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1292{
1293        struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1294        struct string_list src_tag = STRING_LIST_INIT_NODUP;
1295        struct string_list_item *item;
1296        struct ref *ref;
1297        struct tips sent_tips;
1298
1299        /*
1300         * Collect everything we know they would have at the end of
1301         * this push, and collect all tags they have.
1302         */
1303        memset(&sent_tips, 0, sizeof(sent_tips));
1304        for (ref = *dst; ref; ref = ref->next) {
1305                if (ref->peer_ref &&
1306                    !is_null_oid(&ref->peer_ref->new_oid))
1307                        add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1308                else
1309                        add_to_tips(&sent_tips, &ref->old_oid);
1310                if (starts_with(ref->name, "refs/tags/"))
1311                        string_list_append(&dst_tag, ref->name);
1312        }
1313        clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1314
1315        string_list_sort(&dst_tag);
1316
1317        /* Collect tags they do not have. */
1318        for (ref = src; ref; ref = ref->next) {
1319                if (!starts_with(ref->name, "refs/tags/"))
1320                        continue; /* not a tag */
1321                if (string_list_has_string(&dst_tag, ref->name))
1322                        continue; /* they already have it */
1323                if (sha1_object_info(ref->new_oid.hash, NULL) != OBJ_TAG)
1324                        continue; /* be conservative */
1325                item = string_list_append(&src_tag, ref->name);
1326                item->util = ref;
1327        }
1328        string_list_clear(&dst_tag, 0);
1329
1330        /*
1331         * At this point, src_tag lists tags that are missing from
1332         * dst, and sent_tips lists the tips we are pushing or those
1333         * that we know they already have. An element in the src_tag
1334         * that is an ancestor of any of the sent_tips needs to be
1335         * sent to the other side.
1336         */
1337        if (sent_tips.nr) {
1338                for_each_string_list_item(item, &src_tag) {
1339                        struct ref *ref = item->util;
1340                        struct ref *dst_ref;
1341                        struct commit *commit;
1342
1343                        if (is_null_oid(&ref->new_oid))
1344                                continue;
1345                        commit = lookup_commit_reference_gently(ref->new_oid.hash, 1);
1346                        if (!commit)
1347                                /* not pushing a commit, which is not an error */
1348                                continue;
1349
1350                        /*
1351                         * Is this tag, which they do not have, reachable from
1352                         * any of the commits we are sending?
1353                         */
1354                        if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1355                                continue;
1356
1357                        /* Add it in */
1358                        dst_ref = make_linked_ref(ref->name, dst_tail);
1359                        oidcpy(&dst_ref->new_oid, &ref->new_oid);
1360                        dst_ref->peer_ref = copy_ref(ref);
1361                }
1362        }
1363        string_list_clear(&src_tag, 0);
1364        free(sent_tips.tip);
1365}
1366
1367struct ref *find_ref_by_name(const struct ref *list, const char *name)
1368{
1369        for ( ; list; list = list->next)
1370                if (!strcmp(list->name, name))
1371                        return (struct ref *)list;
1372        return NULL;
1373}
1374
1375static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1376{
1377        for ( ; ref; ref = ref->next)
1378                string_list_append_nodup(ref_index, ref->name)->util = ref;
1379
1380        string_list_sort(ref_index);
1381}
1382
1383/*
1384 * Given only the set of local refs, sanity-check the set of push
1385 * refspecs. We can't catch all errors that match_push_refs would,
1386 * but we can catch some errors early before even talking to the
1387 * remote side.
1388 */
1389int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1390{
1391        struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1392        int ret = 0;
1393        int i;
1394
1395        for (i = 0; i < nr_refspec; i++) {
1396                struct refspec *rs = refspec + i;
1397
1398                if (rs->pattern || rs->matching)
1399                        continue;
1400
1401                ret |= match_explicit_lhs(src, rs, NULL, NULL);
1402        }
1403
1404        free_refspec(nr_refspec, refspec);
1405        return ret;
1406}
1407
1408/*
1409 * Given the set of refs the local repository has, the set of refs the
1410 * remote repository has, and the refspec used for push, determine
1411 * what remote refs we will update and with what value by setting
1412 * peer_ref (which object is being pushed) and force (if the push is
1413 * forced) in elements of "dst". The function may add new elements to
1414 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1415 */
1416int match_push_refs(struct ref *src, struct ref **dst,
1417                    int nr_refspec, const char **refspec, int flags)
1418{
1419        struct refspec *rs;
1420        int send_all = flags & MATCH_REFS_ALL;
1421        int send_mirror = flags & MATCH_REFS_MIRROR;
1422        int send_prune = flags & MATCH_REFS_PRUNE;
1423        int errs;
1424        static const char *default_refspec[] = { ":", NULL };
1425        struct ref *ref, **dst_tail = tail_ref(dst);
1426        struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1427
1428        if (!nr_refspec) {
1429                nr_refspec = 1;
1430                refspec = default_refspec;
1431        }
1432        rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1433        errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1434
1435        /* pick the remainder */
1436        for (ref = src; ref; ref = ref->next) {
1437                struct string_list_item *dst_item;
1438                struct ref *dst_peer;
1439                const struct refspec *pat = NULL;
1440                char *dst_name;
1441
1442                dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1443                if (!dst_name)
1444                        continue;
1445
1446                if (!dst_ref_index.nr)
1447                        prepare_ref_index(&dst_ref_index, *dst);
1448
1449                dst_item = string_list_lookup(&dst_ref_index, dst_name);
1450                dst_peer = dst_item ? dst_item->util : NULL;
1451                if (dst_peer) {
1452                        if (dst_peer->peer_ref)
1453                                /* We're already sending something to this ref. */
1454                                goto free_name;
1455                } else {
1456                        if (pat->matching && !(send_all || send_mirror))
1457                                /*
1458                                 * Remote doesn't have it, and we have no
1459                                 * explicit pattern, and we don't have
1460                                 * --all or --mirror.
1461                                 */
1462                                goto free_name;
1463
1464                        /* Create a new one and link it */
1465                        dst_peer = make_linked_ref(dst_name, &dst_tail);
1466                        oidcpy(&dst_peer->new_oid, &ref->new_oid);
1467                        string_list_insert(&dst_ref_index,
1468                                dst_peer->name)->util = dst_peer;
1469                }
1470                dst_peer->peer_ref = copy_ref(ref);
1471                dst_peer->force = pat->force;
1472        free_name:
1473                free(dst_name);
1474        }
1475
1476        string_list_clear(&dst_ref_index, 0);
1477
1478        if (flags & MATCH_REFS_FOLLOW_TAGS)
1479                add_missing_tags(src, dst, &dst_tail);
1480
1481        if (send_prune) {
1482                struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1483                /* check for missing refs on the remote */
1484                for (ref = *dst; ref; ref = ref->next) {
1485                        char *src_name;
1486
1487                        if (ref->peer_ref)
1488                                /* We're already sending something to this ref. */
1489                                continue;
1490
1491                        src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1492                        if (src_name) {
1493                                if (!src_ref_index.nr)
1494                                        prepare_ref_index(&src_ref_index, src);
1495                                if (!string_list_has_string(&src_ref_index,
1496                                            src_name))
1497                                        ref->peer_ref = alloc_delete_ref();
1498                                free(src_name);
1499                        }
1500                }
1501                string_list_clear(&src_ref_index, 0);
1502        }
1503        if (errs)
1504                return -1;
1505        return 0;
1506}
1507
1508void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1509                             int force_update)
1510{
1511        struct ref *ref;
1512
1513        for (ref = remote_refs; ref; ref = ref->next) {
1514                int force_ref_update = ref->force || force_update;
1515                int reject_reason = 0;
1516
1517                if (ref->peer_ref)
1518                        oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1519                else if (!send_mirror)
1520                        continue;
1521
1522                ref->deletion = is_null_oid(&ref->new_oid);
1523                if (!ref->deletion &&
1524                        !oidcmp(&ref->old_oid, &ref->new_oid)) {
1525                        ref->status = REF_STATUS_UPTODATE;
1526                        continue;
1527                }
1528
1529                /*
1530                 * If the remote ref has moved and is now different
1531                 * from what we expect, reject any push.
1532                 *
1533                 * It also is an error if the user told us to check
1534                 * with the remote-tracking branch to find the value
1535                 * to expect, but we did not have such a tracking
1536                 * branch.
1537                 */
1538                if (ref->expect_old_sha1) {
1539                        if (oidcmp(&ref->old_oid, &ref->old_oid_expect))
1540                                reject_reason = REF_STATUS_REJECT_STALE;
1541                        else
1542                                /* If the ref isn't stale then force the update. */
1543                                force_ref_update = 1;
1544                }
1545
1546                /*
1547                 * If the update isn't already rejected then check
1548                 * the usual "must fast-forward" rules.
1549                 *
1550                 * Decide whether an individual refspec A:B can be
1551                 * pushed.  The push will succeed if any of the
1552                 * following are true:
1553                 *
1554                 * (1) the remote reference B does not exist
1555                 *
1556                 * (2) the remote reference B is being removed (i.e.,
1557                 *     pushing :B where no source is specified)
1558                 *
1559                 * (3) the destination is not under refs/tags/, and
1560                 *     if the old and new value is a commit, the new
1561                 *     is a descendant of the old.
1562                 *
1563                 * (4) it is forced using the +A:B notation, or by
1564                 *     passing the --force argument
1565                 */
1566
1567                if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1568                        if (starts_with(ref->name, "refs/tags/"))
1569                                reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1570                        else if (!has_object_file(&ref->old_oid))
1571                                reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1572                        else if (!lookup_commit_reference_gently(ref->old_oid.hash, 1) ||
1573                                 !lookup_commit_reference_gently(ref->new_oid.hash, 1))
1574                                reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1575                        else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1576                                reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1577                }
1578
1579                /*
1580                 * "--force" will defeat any rejection implemented
1581                 * by the rules above.
1582                 */
1583                if (!force_ref_update)
1584                        ref->status = reject_reason;
1585                else if (reject_reason)
1586                        ref->forced_update = 1;
1587        }
1588}
1589
1590static void set_merge(struct branch *ret)
1591{
1592        struct remote *remote;
1593        char *ref;
1594        struct object_id oid;
1595        int i;
1596
1597        if (!ret)
1598                return; /* no branch */
1599        if (ret->merge)
1600                return; /* already run */
1601        if (!ret->remote_name || !ret->merge_nr) {
1602                /*
1603                 * no merge config; let's make sure we don't confuse callers
1604                 * with a non-zero merge_nr but a NULL merge
1605                 */
1606                ret->merge_nr = 0;
1607                return;
1608        }
1609
1610        remote = remote_get(ret->remote_name);
1611
1612        ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1613        for (i = 0; i < ret->merge_nr; i++) {
1614                ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1615                ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1616                if (!remote_find_tracking(remote, ret->merge[i]) ||
1617                    strcmp(ret->remote_name, "."))
1618                        continue;
1619                if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1620                             oid.hash, &ref) == 1)
1621                        ret->merge[i]->dst = ref;
1622                else
1623                        ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1624        }
1625}
1626
1627struct branch *branch_get(const char *name)
1628{
1629        struct branch *ret;
1630
1631        read_config();
1632        if (!name || !*name || !strcmp(name, "HEAD"))
1633                ret = current_branch;
1634        else
1635                ret = make_branch(name, 0);
1636        set_merge(ret);
1637        return ret;
1638}
1639
1640int branch_has_merge_config(struct branch *branch)
1641{
1642        return branch && !!branch->merge;
1643}
1644
1645int branch_merge_matches(struct branch *branch,
1646                                 int i,
1647                                 const char *refname)
1648{
1649        if (!branch || i < 0 || i >= branch->merge_nr)
1650                return 0;
1651        return refname_match(branch->merge[i]->src, refname);
1652}
1653
1654__attribute__((format (printf,2,3)))
1655static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1656{
1657        if (err) {
1658                va_list ap;
1659                va_start(ap, fmt);
1660                strbuf_vaddf(err, fmt, ap);
1661                va_end(ap);
1662        }
1663        return NULL;
1664}
1665
1666const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1667{
1668        if (!branch)
1669                return error_buf(err, _("HEAD does not point to a branch"));
1670
1671        if (!branch->merge || !branch->merge[0]) {
1672                /*
1673                 * no merge config; is it because the user didn't define any,
1674                 * or because it is not a real branch, and get_branch
1675                 * auto-vivified it?
1676                 */
1677                if (!ref_exists(branch->refname))
1678                        return error_buf(err, _("no such branch: '%s'"),
1679                                         branch->name);
1680                return error_buf(err,
1681                                 _("no upstream configured for branch '%s'"),
1682                                 branch->name);
1683        }
1684
1685        if (!branch->merge[0]->dst)
1686                return error_buf(err,
1687                                 _("upstream branch '%s' not stored as a remote-tracking branch"),
1688                                 branch->merge[0]->src);
1689
1690        return branch->merge[0]->dst;
1691}
1692
1693static const char *tracking_for_push_dest(struct remote *remote,
1694                                          const char *refname,
1695                                          struct strbuf *err)
1696{
1697        char *ret;
1698
1699        ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
1700        if (!ret)
1701                return error_buf(err,
1702                                 _("push destination '%s' on remote '%s' has no local tracking branch"),
1703                                 refname, remote->name);
1704        return ret;
1705}
1706
1707static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1708{
1709        struct remote *remote;
1710
1711        remote = remote_get(pushremote_for_branch(branch, NULL));
1712        if (!remote)
1713                return error_buf(err,
1714                                 _("branch '%s' has no remote for pushing"),
1715                                 branch->name);
1716
1717        if (remote->push_refspec_nr) {
1718                char *dst;
1719                const char *ret;
1720
1721                dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1722                                     branch->refname);
1723                if (!dst)
1724                        return error_buf(err,
1725                                         _("push refspecs for '%s' do not include '%s'"),
1726                                         remote->name, branch->name);
1727
1728                ret = tracking_for_push_dest(remote, dst, err);
1729                free(dst);
1730                return ret;
1731        }
1732
1733        if (remote->mirror)
1734                return tracking_for_push_dest(remote, branch->refname, err);
1735
1736        switch (push_default) {
1737        case PUSH_DEFAULT_NOTHING:
1738                return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1739
1740        case PUSH_DEFAULT_MATCHING:
1741        case PUSH_DEFAULT_CURRENT:
1742                return tracking_for_push_dest(remote, branch->refname, err);
1743
1744        case PUSH_DEFAULT_UPSTREAM:
1745                return branch_get_upstream(branch, err);
1746
1747        case PUSH_DEFAULT_UNSPECIFIED:
1748        case PUSH_DEFAULT_SIMPLE:
1749                {
1750                        const char *up, *cur;
1751
1752                        up = branch_get_upstream(branch, err);
1753                        if (!up)
1754                                return NULL;
1755                        cur = tracking_for_push_dest(remote, branch->refname, err);
1756                        if (!cur)
1757                                return NULL;
1758                        if (strcmp(cur, up))
1759                                return error_buf(err,
1760                                                 _("cannot resolve 'simple' push to a single destination"));
1761                        return cur;
1762                }
1763        }
1764
1765        die("BUG: unhandled push situation");
1766}
1767
1768const char *branch_get_push(struct branch *branch, struct strbuf *err)
1769{
1770        if (!branch)
1771                return error_buf(err, _("HEAD does not point to a branch"));
1772
1773        if (!branch->push_tracking_ref)
1774                branch->push_tracking_ref = branch_get_push_1(branch, err);
1775        return branch->push_tracking_ref;
1776}
1777
1778static int ignore_symref_update(const char *refname)
1779{
1780        struct object_id oid;
1781        int flag;
1782
1783        if (!resolve_ref_unsafe(refname, 0, oid.hash, &flag))
1784                return 0; /* non-existing refs are OK */
1785        return (flag & REF_ISSYMREF);
1786}
1787
1788/*
1789 * Create and return a list of (struct ref) consisting of copies of
1790 * each remote_ref that matches refspec.  refspec must be a pattern.
1791 * Fill in the copies' peer_ref to describe the local tracking refs to
1792 * which they map.  Omit any references that would map to an existing
1793 * local symbolic ref.
1794 */
1795static struct ref *get_expanded_map(const struct ref *remote_refs,
1796                                    const struct refspec *refspec)
1797{
1798        const struct ref *ref;
1799        struct ref *ret = NULL;
1800        struct ref **tail = &ret;
1801
1802        for (ref = remote_refs; ref; ref = ref->next) {
1803                char *expn_name = NULL;
1804
1805                if (strchr(ref->name, '^'))
1806                        continue; /* a dereference item */
1807                if (match_name_with_pattern(refspec->src, ref->name,
1808                                            refspec->dst, &expn_name) &&
1809                    !ignore_symref_update(expn_name)) {
1810                        struct ref *cpy = copy_ref(ref);
1811
1812                        cpy->peer_ref = alloc_ref(expn_name);
1813                        if (refspec->force)
1814                                cpy->peer_ref->force = 1;
1815                        *tail = cpy;
1816                        tail = &cpy->next;
1817                }
1818                free(expn_name);
1819        }
1820
1821        return ret;
1822}
1823
1824static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1825{
1826        const struct ref *ref;
1827        for (ref = refs; ref; ref = ref->next) {
1828                if (refname_match(name, ref->name))
1829                        return ref;
1830        }
1831        return NULL;
1832}
1833
1834struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1835{
1836        const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1837
1838        if (!ref)
1839                return NULL;
1840
1841        return copy_ref(ref);
1842}
1843
1844static struct ref *get_local_ref(const char *name)
1845{
1846        if (!name || name[0] == '\0')
1847                return NULL;
1848
1849        if (starts_with(name, "refs/"))
1850                return alloc_ref(name);
1851
1852        if (starts_with(name, "heads/") ||
1853            starts_with(name, "tags/") ||
1854            starts_with(name, "remotes/"))
1855                return alloc_ref_with_prefix("refs/", 5, name);
1856
1857        return alloc_ref_with_prefix("refs/heads/", 11, name);
1858}
1859
1860int get_fetch_map(const struct ref *remote_refs,
1861                  const struct refspec *refspec,
1862                  struct ref ***tail,
1863                  int missing_ok)
1864{
1865        struct ref *ref_map, **rmp;
1866
1867        if (refspec->pattern) {
1868                ref_map = get_expanded_map(remote_refs, refspec);
1869        } else {
1870                const char *name = refspec->src[0] ? refspec->src : "HEAD";
1871
1872                if (refspec->exact_sha1) {
1873                        ref_map = alloc_ref(name);
1874                        get_oid_hex(name, &ref_map->old_oid);
1875                } else {
1876                        ref_map = get_remote_ref(remote_refs, name);
1877                }
1878                if (!missing_ok && !ref_map)
1879                        die("Couldn't find remote ref %s", name);
1880                if (ref_map) {
1881                        ref_map->peer_ref = get_local_ref(refspec->dst);
1882                        if (ref_map->peer_ref && refspec->force)
1883                                ref_map->peer_ref->force = 1;
1884                }
1885        }
1886
1887        for (rmp = &ref_map; *rmp; ) {
1888                if ((*rmp)->peer_ref) {
1889                        if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1890                            check_refname_format((*rmp)->peer_ref->name, 0)) {
1891                                struct ref *ignore = *rmp;
1892                                error("* Ignoring funny ref '%s' locally",
1893                                      (*rmp)->peer_ref->name);
1894                                *rmp = (*rmp)->next;
1895                                free(ignore->peer_ref);
1896                                free(ignore);
1897                                continue;
1898                        }
1899                }
1900                rmp = &((*rmp)->next);
1901        }
1902
1903        if (ref_map)
1904                tail_link_ref(ref_map, tail);
1905
1906        return 0;
1907}
1908
1909int resolve_remote_symref(struct ref *ref, struct ref *list)
1910{
1911        if (!ref->symref)
1912                return 0;
1913        for (; list; list = list->next)
1914                if (!strcmp(ref->symref, list->name)) {
1915                        oidcpy(&ref->old_oid, &list->old_oid);
1916                        return 0;
1917                }
1918        return 1;
1919}
1920
1921static void unmark_and_free(struct commit_list *list, unsigned int mark)
1922{
1923        while (list) {
1924                struct commit *commit = pop_commit(&list);
1925                commit->object.flags &= ~mark;
1926        }
1927}
1928
1929int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
1930{
1931        struct object *o;
1932        struct commit *old, *new;
1933        struct commit_list *list, *used;
1934        int found = 0;
1935
1936        /*
1937         * Both new and old must be commit-ish and new is descendant of
1938         * old.  Otherwise we require --force.
1939         */
1940        o = deref_tag(parse_object(old_oid->hash), NULL, 0);
1941        if (!o || o->type != OBJ_COMMIT)
1942                return 0;
1943        old = (struct commit *) o;
1944
1945        o = deref_tag(parse_object(new_oid->hash), NULL, 0);
1946        if (!o || o->type != OBJ_COMMIT)
1947                return 0;
1948        new = (struct commit *) o;
1949
1950        if (parse_commit(new) < 0)
1951                return 0;
1952
1953        used = list = NULL;
1954        commit_list_insert(new, &list);
1955        while (list) {
1956                new = pop_most_recent_commit(&list, TMP_MARK);
1957                commit_list_insert(new, &used);
1958                if (new == old) {
1959                        found = 1;
1960                        break;
1961                }
1962        }
1963        unmark_and_free(list, TMP_MARK);
1964        unmark_and_free(used, TMP_MARK);
1965        return found;
1966}
1967
1968/*
1969 * Compare a branch with its upstream, and save their differences (number
1970 * of commits) in *num_ours and *num_theirs. The name of the upstream branch
1971 * (or NULL if no upstream is defined) is returned via *upstream_name, if it
1972 * is not itself NULL.
1973 *
1974 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1975 * upstream defined, or ref does not exist), 0 otherwise.
1976 */
1977int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1978                       const char **upstream_name)
1979{
1980        struct object_id oid;
1981        struct commit *ours, *theirs;
1982        struct rev_info revs;
1983        const char *base;
1984        struct argv_array argv = ARGV_ARRAY_INIT;
1985
1986        /* Cannot stat unless we are marked to build on top of somebody else. */
1987        base = branch_get_upstream(branch, NULL);
1988        if (upstream_name)
1989                *upstream_name = base;
1990        if (!base)
1991                return -1;
1992
1993        /* Cannot stat if what we used to build on no longer exists */
1994        if (read_ref(base, oid.hash))
1995                return -1;
1996        theirs = lookup_commit_reference(oid.hash);
1997        if (!theirs)
1998                return -1;
1999
2000        if (read_ref(branch->refname, oid.hash))
2001                return -1;
2002        ours = lookup_commit_reference(oid.hash);
2003        if (!ours)
2004                return -1;
2005
2006        /* are we the same? */
2007        if (theirs == ours) {
2008                *num_theirs = *num_ours = 0;
2009                return 0;
2010        }
2011
2012        /* Run "rev-list --left-right ours...theirs" internally... */
2013        argv_array_push(&argv, ""); /* ignored */
2014        argv_array_push(&argv, "--left-right");
2015        argv_array_pushf(&argv, "%s...%s",
2016                         oid_to_hex(&ours->object.oid),
2017                         oid_to_hex(&theirs->object.oid));
2018        argv_array_push(&argv, "--");
2019
2020        init_revisions(&revs, NULL);
2021        setup_revisions(argv.argc, argv.argv, &revs, NULL);
2022        if (prepare_revision_walk(&revs))
2023                die("revision walk setup failed");
2024
2025        /* ... and count the commits on each side. */
2026        *num_ours = 0;
2027        *num_theirs = 0;
2028        while (1) {
2029                struct commit *c = get_revision(&revs);
2030                if (!c)
2031                        break;
2032                if (c->object.flags & SYMMETRIC_LEFT)
2033                        (*num_ours)++;
2034                else
2035                        (*num_theirs)++;
2036        }
2037
2038        /* clear object flags smudged by the above traversal */
2039        clear_commit_marks(ours, ALL_REV_FLAGS);
2040        clear_commit_marks(theirs, ALL_REV_FLAGS);
2041
2042        argv_array_clear(&argv);
2043        return 0;
2044}
2045
2046/*
2047 * Return true when there is anything to report, otherwise false.
2048 */
2049int format_tracking_info(struct branch *branch, struct strbuf *sb)
2050{
2051        int ours, theirs;
2052        const char *full_base;
2053        char *base;
2054        int upstream_is_gone = 0;
2055
2056        if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
2057                if (!full_base)
2058                        return 0;
2059                upstream_is_gone = 1;
2060        }
2061
2062        base = shorten_unambiguous_ref(full_base, 0);
2063        if (upstream_is_gone) {
2064                strbuf_addf(sb,
2065                        _("Your branch is based on '%s', but the upstream is gone.\n"),
2066                        base);
2067                if (advice_status_hints)
2068                        strbuf_addstr(sb,
2069                                _("  (use \"git branch --unset-upstream\" to fixup)\n"));
2070        } else if (!ours && !theirs) {
2071                strbuf_addf(sb,
2072                        _("Your branch is up-to-date with '%s'.\n"),
2073                        base);
2074        } else if (!theirs) {
2075                strbuf_addf(sb,
2076                        Q_("Your branch is ahead of '%s' by %d commit.\n",
2077                           "Your branch is ahead of '%s' by %d commits.\n",
2078                           ours),
2079                        base, ours);
2080                if (advice_status_hints)
2081                        strbuf_addstr(sb,
2082                                _("  (use \"git push\" to publish your local commits)\n"));
2083        } else if (!ours) {
2084                strbuf_addf(sb,
2085                        Q_("Your branch is behind '%s' by %d commit, "
2086                               "and can be fast-forwarded.\n",
2087                           "Your branch is behind '%s' by %d commits, "
2088                               "and can be fast-forwarded.\n",
2089                           theirs),
2090                        base, theirs);
2091                if (advice_status_hints)
2092                        strbuf_addstr(sb,
2093                                _("  (use \"git pull\" to update your local branch)\n"));
2094        } else {
2095                strbuf_addf(sb,
2096                        Q_("Your branch and '%s' have diverged,\n"
2097                               "and have %d and %d different commit each, "
2098                               "respectively.\n",
2099                           "Your branch and '%s' have diverged,\n"
2100                               "and have %d and %d different commits each, "
2101                               "respectively.\n",
2102                           ours + theirs),
2103                        base, ours, theirs);
2104                if (advice_status_hints)
2105                        strbuf_addstr(sb,
2106                                _("  (use \"git pull\" to merge the remote branch into yours)\n"));
2107        }
2108        free(base);
2109        return 1;
2110}
2111
2112static int one_local_ref(const char *refname, const struct object_id *oid,
2113                         int flag, void *cb_data)
2114{
2115        struct ref ***local_tail = cb_data;
2116        struct ref *ref;
2117
2118        /* we already know it starts with refs/ to get here */
2119        if (check_refname_format(refname + 5, 0))
2120                return 0;
2121
2122        ref = alloc_ref(refname);
2123        oidcpy(&ref->new_oid, oid);
2124        **local_tail = ref;
2125        *local_tail = &ref->next;
2126        return 0;
2127}
2128
2129struct ref *get_local_heads(void)
2130{
2131        struct ref *local_refs = NULL, **local_tail = &local_refs;
2132
2133        for_each_ref(one_local_ref, &local_tail);
2134        return local_refs;
2135}
2136
2137struct ref *guess_remote_head(const struct ref *head,
2138                              const struct ref *refs,
2139                              int all)
2140{
2141        const struct ref *r;
2142        struct ref *list = NULL;
2143        struct ref **tail = &list;
2144
2145        if (!head)
2146                return NULL;
2147
2148        /*
2149         * Some transports support directly peeking at
2150         * where HEAD points; if that is the case, then
2151         * we don't have to guess.
2152         */
2153        if (head->symref)
2154                return copy_ref(find_ref_by_name(refs, head->symref));
2155
2156        /* If refs/heads/master could be right, it is. */
2157        if (!all) {
2158                r = find_ref_by_name(refs, "refs/heads/master");
2159                if (r && !oidcmp(&r->old_oid, &head->old_oid))
2160                        return copy_ref(r);
2161        }
2162
2163        /* Look for another ref that points there */
2164        for (r = refs; r; r = r->next) {
2165                if (r != head &&
2166                    starts_with(r->name, "refs/heads/") &&
2167                    !oidcmp(&r->old_oid, &head->old_oid)) {
2168                        *tail = copy_ref(r);
2169                        tail = &((*tail)->next);
2170                        if (!all)
2171                                break;
2172                }
2173        }
2174
2175        return list;
2176}
2177
2178struct stale_heads_info {
2179        struct string_list *ref_names;
2180        struct ref **stale_refs_tail;
2181        struct refspec *refs;
2182        int ref_count;
2183};
2184
2185static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2186                              int flags, void *cb_data)
2187{
2188        struct stale_heads_info *info = cb_data;
2189        struct string_list matches = STRING_LIST_INIT_DUP;
2190        struct refspec query;
2191        int i, stale = 1;
2192        memset(&query, 0, sizeof(struct refspec));
2193        query.dst = (char *)refname;
2194
2195        query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2196        if (matches.nr == 0)
2197                goto clean_exit; /* No matches */
2198
2199        /*
2200         * If we did find a suitable refspec and it's not a symref and
2201         * it's not in the list of refs that currently exist in that
2202         * remote, we consider it to be stale. In order to deal with
2203         * overlapping refspecs, we need to go over all of the
2204         * matching refs.
2205         */
2206        if (flags & REF_ISSYMREF)
2207                goto clean_exit;
2208
2209        for (i = 0; stale && i < matches.nr; i++)
2210                if (string_list_has_string(info->ref_names, matches.items[i].string))
2211                        stale = 0;
2212
2213        if (stale) {
2214                struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2215                oidcpy(&ref->new_oid, oid);
2216        }
2217
2218clean_exit:
2219        string_list_clear(&matches, 0);
2220        return 0;
2221}
2222
2223struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2224{
2225        struct ref *ref, *stale_refs = NULL;
2226        struct string_list ref_names = STRING_LIST_INIT_NODUP;
2227        struct stale_heads_info info;
2228
2229        info.ref_names = &ref_names;
2230        info.stale_refs_tail = &stale_refs;
2231        info.refs = refs;
2232        info.ref_count = ref_count;
2233        for (ref = fetch_map; ref; ref = ref->next)
2234                string_list_append(&ref_names, ref->name);
2235        string_list_sort(&ref_names);
2236        for_each_ref(get_stale_heads_cb, &info);
2237        string_list_clear(&ref_names, 0);
2238        return stale_refs;
2239}
2240
2241/*
2242 * Compare-and-swap
2243 */
2244static void clear_cas_option(struct push_cas_option *cas)
2245{
2246        int i;
2247
2248        for (i = 0; i < cas->nr; i++)
2249                free(cas->entry[i].refname);
2250        free(cas->entry);
2251        memset(cas, 0, sizeof(*cas));
2252}
2253
2254static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2255                                      const char *refname,
2256                                      size_t refnamelen)
2257{
2258        struct push_cas *entry;
2259        ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2260        entry = &cas->entry[cas->nr++];
2261        memset(entry, 0, sizeof(*entry));
2262        entry->refname = xmemdupz(refname, refnamelen);
2263        return entry;
2264}
2265
2266static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2267{
2268        const char *colon;
2269        struct push_cas *entry;
2270
2271        if (unset) {
2272                /* "--no-<option>" */
2273                clear_cas_option(cas);
2274                return 0;
2275        }
2276
2277        if (!arg) {
2278                /* just "--<option>" */
2279                cas->use_tracking_for_rest = 1;
2280                return 0;
2281        }
2282
2283        /* "--<option>=refname" or "--<option>=refname:value" */
2284        colon = strchrnul(arg, ':');
2285        entry = add_cas_entry(cas, arg, colon - arg);
2286        if (!*colon)
2287                entry->use_tracking = 1;
2288        else if (!colon[1])
2289                hashclr(entry->expect);
2290        else if (get_sha1(colon + 1, entry->expect))
2291                return error("cannot parse expected object name '%s'", colon + 1);
2292        return 0;
2293}
2294
2295int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2296{
2297        return parse_push_cas_option(opt->value, arg, unset);
2298}
2299
2300int is_empty_cas(const struct push_cas_option *cas)
2301{
2302        return !cas->use_tracking_for_rest && !cas->nr;
2303}
2304
2305/*
2306 * Look at remote.fetch refspec and see if we have a remote
2307 * tracking branch for the refname there.  Fill its current
2308 * value in sha1[].
2309 * If we cannot do so, return negative to signal an error.
2310 */
2311static int remote_tracking(struct remote *remote, const char *refname,
2312                           struct object_id *oid)
2313{
2314        char *dst;
2315
2316        dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2317        if (!dst)
2318                return -1; /* no tracking ref for refname at remote */
2319        if (read_ref(dst, oid->hash))
2320                return -1; /* we know what the tracking ref is but we cannot read it */
2321        return 0;
2322}
2323
2324static void apply_cas(struct push_cas_option *cas,
2325                      struct remote *remote,
2326                      struct ref *ref)
2327{
2328        int i;
2329
2330        /* Find an explicit --<option>=<name>[:<value>] entry */
2331        for (i = 0; i < cas->nr; i++) {
2332                struct push_cas *entry = &cas->entry[i];
2333                if (!refname_match(entry->refname, ref->name))
2334                        continue;
2335                ref->expect_old_sha1 = 1;
2336                if (!entry->use_tracking)
2337                        hashcpy(ref->old_oid_expect.hash, cas->entry[i].expect);
2338                else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2339                        oidclr(&ref->old_oid_expect);
2340                return;
2341        }
2342
2343        /* Are we using "--<option>" to cover all? */
2344        if (!cas->use_tracking_for_rest)
2345                return;
2346
2347        ref->expect_old_sha1 = 1;
2348        if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2349                oidclr(&ref->old_oid_expect);
2350}
2351
2352void apply_push_cas(struct push_cas_option *cas,
2353                    struct remote *remote,
2354                    struct ref *remote_refs)
2355{
2356        struct ref *ref;
2357        for (ref = remote_refs; ref; ref = ref->next)
2358                apply_cas(cas, remote, ref);
2359}